The Asus Zenfone 2 runs on Android OS, v5.0 (Lollipop) and is powered by Quad-core 2.3 GHz & Quad-core 1.8 GHz processor with 4GB RAM. It has a 5.5-inch, 1080 x 1920 pixel display. The Asus Zenfone 2 also comes with a 13.0-megapixel camera that is able to record videos at 1080p. It comes with 16/32/64GB of built-in storage, and is able to support microSD cards of up to 64GB.